682 research outputs found
Spontaneous symmetry breaking for long-wave gravitons in the early Universe
It is shown that nonlinear terms in equations of gravitons on the background
of curved space-time of the expanding Universe can solve the problem of the
negative square of the effective mass formally arising in linear approximation
for gravitons. Similar to well known spontaneous breaking of symmetry in
Goldstone model one must take another vacuum so that nonzero vacuum expectation
value of the quantized graviton field leads to change of spectrum for
gravitons. There appears two graviton fields, one with the positive mass,
another with the zero mass. Energy density and the density of particles created
by gravitation of the expanding Universe are calculated for some special cases
of the scale factor. Numerical results are obtained for the dust universe case.Comment: 13 page
On the Possible Enhancement of the Magnetic Field by Neutrino Reemission Processes in the Mantle of a Supernova
URCA neutrino reemission processes under the conditions in the mantle of a
supernova with a strong toroidal magnetic field are investigated. It is shown
that parity violation in these processes can be manifested macroscopically as a
torque that rapidly spins up the region of the mantle occupied by such a field.
Neutrino spin-up of the mantle can strongly affect the mechanism of further
generation of the toroidal field, specifically, it can enhance the field in a
small neighborhood of the rigid-body-rotating core of the supernova remnant.Comment: 8 pages, late
The forecasting of the development of suffosion processes in urban on the basis of the geoelectric modeling by the data of the phasometric system of the geodynamic control
In this article, techniques and algorithms of the control and forecasting of the karst risk of the territory are considered. The formation of forecast assessments of the development of suffosion processes is carried out on the basis of the computer modeling with the correction of model data on the flexible schedule by results of the monitorin
The algorithms of preliminary processing of the inclinometric control data during the monitoring of the building
The article is devoted to the development of algorithmic support of the inclinometric control system built on the basis of accelerometers using the phase-metric method. This system is used to automated control the deviation of the angular parameters of the building axis from the vertica
Ball milling effect on the properties of ultra high molecular weight Polyethylene - bronze composite
Peculiarities of the technology to produce a composite material based on ultra-high molecular weight polyethylene (UHMWPE), mechanically activated with bronze powder are considered along with the properties of the produced material. Samples of the press-composition on the basis of UHMWPE with 0 up to 97.5% of the bronze powder addition were prepared by joint mechanoactivation of super-high-molecular polymer and the bronze powder using planetary mechanoactivator MPF-1 and toroidal vibration mechanoactivator MV-0.05. Packed density of the press-composition was analyzed as a function of the formula
and the mechanoactivation technique used. Bulk samples for the tests were obtained by direct pressing. The properties of the samples were studied, and the relations between the density of the material, the physical and mechanical and thermal-physical properties and the concentration of the bronze powder in the material and the milling time were investigated
Analysis of noise characteristics of multichannel systems of the formation of signals of georadars with synthesized aperture
The noise characteristics of multichannel systems of forming signals based on hybrid frequency synthesizers with automatic compensation of phase distortions of direct digital synthesizers, which are used in the composition of georadars with synthesized aperture, are investigate
Development and research of the geoelectric model of the local zone of geodynamic control
The article deals with the question of constructing a geoelectrical model used in geotechnical control systems on the local areas of geodynamic observations. An equivalent scheme for replacing the geological medium at a local point of geodynamic control was develope
A search for J^{PC}=1^{-+} exotic mesons in the pi- pi- pi+ and pi- pi0 pi0 systems
A partial wave analysis (PWA) of the pi-pi-pi+ and pi-pi0pi0 systems produced
in the reaction pi- p -> (3pi)-p at 18 GeV/c was carried out using an isobar
model assumption. This analysis is based on 3.0M pi-pi0pi0 events and 2.6M
pi-pi-pi+ events and shows production of the a2(1320), pi2(1670) and \pi(1800)
mesons. An earlier analysis of 250K pi-pi-pi+ events from the same experiment
showed possible evidence for a J^{PC}=1^{-+}$ exotic meson with a mass of 1.6
GeV/c^2 decaying into rho pi. In this analysis of a higher statistics sample of
the (3pi)- system in two charged modes we find no evidence of an exotic meson.Comment: 4 pages, 5 figures, added comment about the negative reflectivity
exotic wave
Spin-down of neutron stars by neutrino emission
We study the spin-down of a neutron star during its early stages due to the
neutrino emission. The mechanism we consider is the subsequent collisions of
the produced neutrinos with the outer shells of the star. We find that this
mechanism can indeed slow down the star rotation but only in the first tens of
seconds of the core formation, which is when the appropriate conditions of flux
and collision rate are met. We find that this mechanism can extract less than 1
% of the star angular momentum, a result which is much less than previously
estimated by other authors.Comment: 9 pages, 2 eps figures, RevTeX 4-1. The paper was significantly
modified. Now it addresses only the issues of a neutron star spin-down.
Version to be published in Phys. Rev.
Radiative Effects in the Standard Model Extension
The possibility of radiative effects induced by the Lorentz and CPT
non-invariant interaction term for fermions in the Standard Model Extension is
investigated. In particular, electron-positron photo-production and photon
emission by electrons and positrons are studied. The rates of these processes
are calculated in the Furry picture. It is demonstrated that the rates obtained
in the framework of the model adopted strongly depend on the polarization
states of the particles involved. As a result, ultra-relativistic particles
produced should occupy states with a preferred spin orientation, i.e., photons
have the sign of polarization opposite to the sign of the effective potential,
while charged particle are preferably in the state with the helicity coinciding
with the sign of the effective potential. This leads to evident spatial
asymmetries which may have certain consequences observable at high energy
accelerators, and in astrophysical and cosmological studies.Comment: 10 pages, 2 figures, Revtex4, to appear in Phys.Rev.D, misprints are
correcte
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